Device for holding work upon machine-tools.



LGROSS. DEVICE FOR HOLDINGWORK UPON MACHINE TOOLS.

\PPLICATION FILED 1ULY 131HH6.

' Patented Ap1 .16,19l8.'

fi'zvenfor" ZeQpoZc 7-0J5 .NIED sra rnf's LEoroLn enoss; or Armenia,ILLINOIS.

onion.

nnvro'n Fos-Hotnma WORK UPON MACHINE-Toots. I

racers-1.

filed .Tilly'l, Serial No.

To all Masa a we e,

My invention relatesgenerally to improvements inmeans for holdingworkupon machine. t ls a d. ha par icu a re t means for holding-work uponmachine tools provided WithaT -,slo.ts.

. The,- general ;ob ect, of v invention to provide mean s. whereby worl;of ,di-fferent thicknesses can be secured in workingconditionwithoutlthe necessity of having a large number of securingbolts of different lengths.

A further .object of; myinventionisto provide means whereby, wlth alimitednumber of given length bolts, work of greatly differing sizes orthicknesses can be secured.

Other obgeots of my invention are to 511mplify the securing of work uponmachlne tools; to reduce the time necessary for such I operations; andto provide means which can be attached to hollow work after it has beensecured to the machine.

My invention consists generally in the form, arrangement, andconstruction of parts whereby the above named objects, together withothers which will appear hereinafter, are attainable.

My invention will be more readily understOOd by reference to theaccompanying drawings, illustrating the preferred embodiment thereof,and wherein- Figure 1 is a View in elevation, illustrating work securedto a machine tool by devices embodyin my invention.

Fig. 2 is a plan view of a fragmentary part of a machine tool bedshowing the work secured thereto by devices embodying my invention,

Fig. 3 is a perspective view of one of the coupling members embodying myinvention.

In using various machine tools, such, for example, as shapers, planers,lathes, drill presses, etc., it is customary to secure the work to beoperated upon to the bed, face plate, Or other work carrying member bymeans of bolts, the heads of which enter T slots in the bed or faceplate, and the ends of the bolts passing through straps which engage thework. Under modern machine practice a given machine Wlll operate uponSpecification of Letters Patent;

manta 155. @1515:

' aaa greas var ing sizes aiidthielgnessesandit has hitherto-beennecessary to r v ew rea number of bel o diffel'sm engths to secure suchwork. As a' niim berof bolts are necessary fto holdeach piece of.workfirmly in pla ce, it will be seen that with the many. lengthsnecessary a large stock'ofbolts must be provided Thisis'p'an t cularlyburdensome n a generalmachlne shop where several pieces oifi workof thcsame length may be operated upon simultaneously. .Not only does thisnecessitate I gla e may Oimoney b.1 1 themach ni s'delaye linfindmgth pri r ia craglreelicb- I haveprovided .nieansjwhere'by a relatively f w bes a .m degt er e Ql. ms ev ses ur onve p th c msssgthifehy greatlyreducing the number of holding bolts ne ss ry ania o q l a s the Peratiof fastening a given piece of work upon the machine.

Having thus described the general objects and purposes of my invention,I shall describe the construction in detail, reference being had to theaccompanying drawings, wherein 1 represents a work holding bed or plateof a machine tool provided with a plurality 01:" T slots 2. 3 representsa piece of work which is ecured to the plate or bed by means of straps 4of usual construction. These strap 4 have hitherto been bound to thework by means of bolts, the heads of which entered the T slots in thebed and which bolt were long enough to reach to and through the straps.Instead of providing a large number of bolts of different lengths, Iprovide a number of short length bolts 5, which for sake of convenienceI shall refer to herein as unit bolts. These unit bolts each have a head6 of a ize adapted to enter the T slots 2 in the bed and a threaded end7. The work 3 in this instance is of such thickness that it cannot bespanned by a single unit bolt and in this event I connect another unitbolt to the one enterin the bed by means of a simple device 8 which Ishall herein refer to as a unit bolt connector. This novel unit boltconnector comprises an end portion 9, which is internally threaded, asindicated at 9, for complementary engagement with the threaded end ofthe unit bolt. Upstanding from the portion 9 are spaced arms 10supporting a transverse portion 11, in which I form a slot 12 0]": awidth sufficient to admit the shank portion of a unit bolt. I so spacethe upstanding arm 10 as to form a space or recess 13 of a sizesuflicient to admit the head of the bolt. Thus to connect two unit boltsit is but necessary to screw the unit bolt connector upon the end of aunit bolt and to place the head of the second bolt into the space 13 ofthe unit bolt connector.

The shank portion of the bolt is of course accommodated in the slot 12.The end of the second unit bolt serves to take an ordinary nut 14.

Inasmuch as this disclosure will readily suggest modified structuresembodying my invention, I do not Wish to be limited to the specificconstructions herein shown and described, except a may be necessary bylimitations in the hereunto appended claims.

I claim: 7

1., Means for holding Work upon machine tools, comprising in combinationwith a machine bed provided with undercut slots therein, headed boltmembers with their heads disposed in said undercut slots, a connectingbar having headed bolts secured therein and bolt connectors forconnecting the bolts in the slots and the bolts in the connecting bar,said bolt connectors being pro- Copflec or thils patent may be obtainedfor vided with threaded openings to receive threaded ends of the boltsin the bed and slots and recesses to receive the headed ends of thebolts of the connecting bar.

2. Means for holding Work upon machine tools, comprising in combinationwith a machine bed provided with undercut slots, a pair of headed boltmembers with their heads movably disposed within said undercut slots, aconnecting bar for engaging the work tobe held on the machine bed andprovided at each end With a headed bolt secured therein, the headedbolts of the connecting bar and the headed bolts of the machine bedadapted to aline, and bolt connectors for connecting the bolts of theconnecting bar with the bolt of the machine bed, said bolt connectorsbeing provided with threaded openings to receive the threaded ends ofthe L bolts in the bed and also provided with slots and recesses toreceive the headed ends of the bolts of the connecting bar.

In testimony-whereof, I have hereunto set my hand, this 26th day ofJune, 1916.

LEOPOLD enoss.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. r

